Periodic structures based on coupled Helmholtz resonators for broadband noise suppression (en)

* Presenting author
Day / Time: 08.03.2023, 17:00-17:20
Room: Saal X 1-2
Typ: Regulärer Vortrag
Abstract: In this work we study periodic arrays of strongly coupled Helmholtz resonators in order to design a structure allowing broadband noise insulation. The aim is to develop a sparse structure to achieve ventilation and partial optical transparency while preserving a simple design. The investigations start from an infinite periodic structure and tuning of its parameters to maximize band-gaps. After that the equivalent semi-infinite and finite structures are studied numerically and experimentally. The measured spectrally averaged transmission coefficients within a range from 2000 to 16500 Hz are -31.6 dB and -18.6 dB, correspondingly. We also show a possibility to achieve a compromise between ventilation and noise insulation. In particular, the spectrally averaged transmission of a finite structure might be about -15 dB while only 25% of an air flow is blocked. In addition, we demonstrate that various structural defects can lead to the enhancement of noise insulating properties.


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